Its not ability. If I am in town I check my speedo. If I am on open roads I ride the bike. Knowing if I am in 4th or 5th is irrelevant and knowing if I am going 50 or 90 isn't important.
Knowing that I am going at the right speed for the corner is what I am looking for and that the engine is spinning enough to get the rush out is important. Neither of these involve speedos or gear indictor, just feel.
Ask me how fast I have been down the Chelveston bends or what gear I was I wouldn't know cos there are a lot more important things to think about, or watch out for, than a set of gauges